fix(cert): 注册 LineChart，修复折线/面积图不渲染

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/views/Production.vue

@@ -297,12 +297,12 @@
 <script>
 import { use } from 'echarts/core'
 import { CanvasRenderer } from 'echarts/renderers'
-import { BarChart } from 'echarts/charts'
+import { BarChart, LineChart } from 'echarts/charts'
 import { GridComponent, TooltipComponent } from 'echarts/components'
 import VChart from 'vue-echarts'
 import { getProductionRecords, createProductionRecord, updateProductionRecord } from '@/api'
 
-use([CanvasRenderer, BarChart, GridComponent, TooltipComponent])
+use([CanvasRenderer, BarChart, LineChart, GridComponent, TooltipComponent])
 
 const STATUS_MAP = {
   UNWEIGH: { label: '未称重', badge: 'badge-yellow' },